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Sharon Shaz Webber added: "Thanks, thought it might have been a bunker of some kind."

The mystery structure uncovered by Storm Emma (Image: Tom Last)

Lesley Andrew wrote: "Wondering if it is wartime sea defences. There is an old 'pill box' lookout on the cliff side which someone has converted into a summer house and most south coast beaches had some form of defence in case of invasion."

Scott Bray said: "Yes, I think these where put into place all the way along the beach as a defence to stop the tanks from landing."